Who are a cappella persons citizen of United States of America?

8

Kirstin Maldonado

singer
8

Wes Carroll

American musician
8

Bobby McFerrin

American jazz vocalist
7

Ysaye Maria Barnwell

American musician
6

Scott Leonard

American singer
4

Sean Altman

American musician and songwriter
4

Alan Paul

American singer
4

Steven Dorian

singer
4

Barry Carl

American opera singer
3

Jerry Lawson

American singer
3

George Baldi III

musician
1

Mitch Grassi

American singer
1

Evynne Hollens

American singer
1

Deke Sharon

American musician
0

Bernice Johnson Reagon

American singer
0

Peter Hollens

American singer